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Credit: Getty Images

SAN ANTONIO - MARCH 4: Democratic presidential hopeful Sen. Barack Obama of Illinois and his wife Michelle greet supporters gathered for a post-primary rally March 4, 2008 in San Antonio, Texas. Poll results in the delegate rich states Ohio and Texas showed Obama jumping to an early lead in Texas while rival Sen. Hillary Clinton of New York held an early lead in Ohio. (Photo by Scott Olson/Getty Images)